From: Richard Kenner <kenner@gcc.gnu.org>
Date: Mon, 21 Mar 1994 22:15:32 +0000 (-0500)
Subject: (preserve_temp_slots): If argument is REG, see if it is address of a
X-Git-Tag: misc/cutover-egcs-0~7100
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e3a771613feb915111421ff10f29937aee88c452;p=thirdparty%2Fgcc.git

(preserve_temp_slots): If argument is REG, see if it is address of a
temp slot we know about.

From-SVN: r6843
---

diff --git a/gcc/function.c b/gcc/function.c
index a266ead2c25e..8726afb2a653 100644
--- a/gcc/function.c
+++ b/gcc/function.c
@@ -946,9 +946,23 @@ preserve_temp_slots (x)
 {
   struct temp_slot *p;
 
+  if (x == 0)
+    return;
+
+  /* If X is a register that is being used as a pointer, see if we have
+     a temporary slot we know it points to.  To be consistent with
+     the code below, we really should preserve all non-kept slots
+     if we can't find a match, but that seems to be much too costly.  */
+  if (GET_CODE (x) == REG && REGNO_POINTER_FLAG (REGNO (x))
+      && (p = find_temp_slot_from_address (x)) != 0)
+    {
+      p->level--;
+      return;
+    }
+    
   /* If X is not in memory or is at a constant address, it cannot be in
      a temporary slot.  */
-  if (x == 0 || GET_CODE (x) != MEM || CONSTANT_P (XEXP (x, 0)))
+  if (GET_CODE (x) != MEM || CONSTANT_P (XEXP (x, 0)))
     return;
 
   /* First see if we can find a match.  */